switch.m

typedef NS_ENUM(NSInteger, MySwitchType) {
    MyUserDefaultPreference1,
    MyUserDefaultPreverence2
}

- (void)someSwitchSetup {
    UISwitch *aSwitch = [UISwitch new];
    
    aSwitch.tag = MyUserDefaultPreference1; // Could be MyUserDefaultBackgroundOn // BackgroundOff etc
    [aSwitch addTarget:self selector:@selector(tapForUserDefaultChange:) forState:UIStateEventChanged]; // I cant remember the state change off the top of my head
    
    
}

- (void)tapForUserDefaultChange:(UISwitch *)aSwitch {
    switch(aSwitch.tag) {
        case MyUserDefaultPreference1:
        // handle preference change 
        break;
        case MyUserDefaultPreference2:
        // handle preference change for 2
        break;
    }
}